Wireless data transmission between base station and transponder with transmission parameter adjusted based on transponder operating information

Abstract

Data encoded in packets modulated onto a carrier wave is transmitted between a base station and a transponder. Each packet includes a header section that contains at least a reference symbol and that serves for adjusting one or more transmission parameters, and a further section such as a data section. The transponder transmits data back to the base station through modulation and backscattering of the carrier wave. During the transmission of the header section by the base station, the transponder transmits transponder operating information relating to the processing of data to be received and/or transmitted by the transponder, by corresponding modulation and backscattering of the carrier wave. In response to and dependent on the received transponder operating information, the base station adjusts at least one transmission parameter, whereby the highest data transmission rate within the capabilities of the particular transponder can be achieved.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application is related to the US Application (Attorney Docket No. 4715) by Ulrich FRIEDRICH and Martin FISCHER, entitled “Wireless Data Transmission Between Base Station and Transponder With Encoding / Decoding Parameter Adjusted Dependent on Header Symbol Duration”, and filed on the same date as this application. The entire disclosure of the related application is incorporated herein by reference. PRIORITY CLAIM [0002] This application is based on and claims the priority under 35 U.S.C. §119 of German Patent Application 103 35 003.9, filed on Jul. 23, 2003, the entire disclosure of which is incorporated herein by reference. FIELD OF THE INVENTION [0003] The invention relates to a method for carrying out wireless data transmission between a base station and a transponder, especially a passive transponder, wherein data packets that each include a header section with at least one symbol and at least one further section are modulated ont...

AI Technical Summary

Benefits of technology

[0013] In view of the above, it is an object of the invention to provide a method for wireless data transmission between a base station and a transponder with a relatively large achievable transmission distance throughout a large transmission rate range in comparison to the prior art, with an optimized power requirement and with relatively low effort and expense. It is another object of the invention to provide such a method which allows the transmission characteristics to be adapted to the capabilities of the respective transponder with which a communication is being carried out, especially allowing such an adaptation to be made “on the fly” during the communication. The invention further aims to avoid or overcome the disadvantages of the prior art, and to achieve additional advantages, as apparent from the present specification. The attainment of these objects is, however, not a required limitation of the present claimed invention.

Problems solved by technology

Particularly, there is an inconsistency or scattering of the time resolution capability of individual transponders to resolve or distinguish the time differences between the symbols and / or characters, i.e. between the distinct time durations of the various symbols and / or characters, being transmitted.

Unfortunately, this means that the base station must transmit the data at a slower data transmission rate than would be necessary for other transponders of the same batch, type or model, which have better than worst-case operating capabilities.

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